Coresion ( a Komodo dragon... I keep on seeing someone post this idea so it was the first thing that came to my mind.) Poison/DragonMythology: A Modern legendary pokemon, It was originally a legendary dragon but was altered waste of Humans. In game, it would be seen attacking the major city that is conveniently placed right before the elite four. It would be instigated by evil group not named who are environmentalists who wanted to show the what humans have caused for there technology (not evil per say but going about things the wrong way.).

Preservantus ( a mossy looking dragon)Grass/DragonMythology: An Ancient Dragon that sleeps in the core of the imaginary region who's name I did not give. It is said to be the source that gives all life to the imaginary region. In game, it would be attacked by evil group in order to harness the dragon's power for an unlimited supply of energy (not evil per say but going about things the wrong way.) Yes, the legendary's situation for the 2 cover will be different but still fought around the same time.

How the myth relates to each other:Preservantus and Coresion both used to be the same species. But As humans started to expand and make cities, the environment had a big impact on Coresion, causing him to morph from the grass/dragon into the poision/dragon. Hence his name Coresion, a combination of the core, As he was originally the cornerstone of the region, and corrosion. Preservantus is just a remade word of preserve.

How the 2 games would be different:Obviously, it's too much to ask for completely different looking regions (one completely city like and the other completely nature like) but each city would either have a giant tree or a power plant. In the game with Coresion, He would have been formed due to the solution to our energy comes at the cost of the environment (the power plants). In the game with Preservantus, the Tree would be there instead of the power plants but people would be living with little energy with a plain life style (compared to the other regions more extravagant appearance).

Obviously, the motif is about the environment and how we have to have a balance between expanding too much and not enough... I was a lot more into this than I intended...---Nintendo? PlayStation? no...http://mangafox.me/manga/mel_kano/v03/c016/27.html